Restringing a steel-string guitar with nylons won't work out well, even extra-high-tension strings will deliver far too little tension to move a top designed for steel. You will also most probably run into intonation problems because steel strings have a higher relative mass difference between the strings than nylon strings (among other things), so they intone differently when you move up the fretboard. So, on steel-stringed acoustic guitars the bridge is set up so that the saddle is angled relative to the soundboard, while on nylons (classical guitar) the saddle is practically perpendicular (like on an ukulele). Which means that if you put nylon strings on a steel-string guitar the E/D/A strings will sound flat as you move up the fretboard. So, the guitar will not ring (too little tension), and intone badly.. conclusion: Keep the steel stringer as-is, and get a second guitar: A classic nylon (it's legal to own more than one instrument.. for many years I lived under the assumption that one couldn't really have more than one at the time, what a mistake!).
Btw, Lowden Guitars make some guitars which look like acoustic steel string guitars (narrow neck etc.) but are actually nylon string guitars. At least they used to have some models like that, some years ago I tried one out in a shop in Denmark Street in London, and it had a lovely sound and great playability. I should have bought it but I didn't. A mistake.